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<br />F I~UR[ - 2 <br /> <br />,cont., <br /> <br />CHA?TERIV <br /> <br /> <br />IIYOROLOGICANALYSIS <br /> <br />Flood Chdrdcteristics <br /> <br />Storms which produce floodwater in the ~E Canon draindge drea pri_ <br />marily occur during the summer months from April throu~h Septe~ber. <br />During thi~ period, wdrm, moist air masses from the Gulf of ~exico c~- <br />bine with cold and comparatively dry air from the polar regions to cause <br />thunderstor~s. The storms are characterized by high rainfall intensities <br />of short duration, producing high peak flows and ~derate vol~~s of <br />wdter. Frequently, the thunderstorms are se~ere and occur o~cr rather <br />1 j",H~~ are~s. <br /> <br />TYPICAL CIIA~~EL StCTiO~ <br />(5T,\19160) <br /> <br />Methods of An~lysis <br /> <br /> <br />Trere ~re no s treJllfl ow r.:;corcs fo'- the ::E Cano", ura i ndge c~s in. <br />Pe~k disch~rges for the lOO-ye~r freque~cy flood were therefore de vel opec <br />wsi"9 tfle ,yr,thetic rain!'.; 1 I-runoff ~vall1at iO>1 proce{jur't:s ue:;Lriued in <br />the Soil Conserva;:ion S~rvic~ lIandu\Jok "Proc{;d1,Jr~s tor Jetemining Pe~k <br />Flo'lis in Co 10radQ," dated M~rch, 1977. Synthetic runoff hydrograpl1s <br />~'ere de'ieloped from the Soil Conservation Service Tridngular lIydrograph <br />Equ~t ion using incrernental hyurographs. A detai led description of the <br />hydrologic analysis is in~luded in the Techrical AduenduM. <br />A 11 runoff COlTlputat iO~$ ,,'ere b~s~d on <,xist ing land use and cover <br />conditions in the w~ter,hed ~s of ~;~rch, ~980. Other drain~ge basin <br /> <br />:h~fJ~tcristi~$ s:;ch ;)~ :;izc, s~~~e, lc;;;th, sl~~~. a"J L:",e ur ~u"le"- <br /> <br />trdt iun 'lie"!! doculf'lCllted for use ~nd are 1 ist~d i~ the TeChnical ;:,tJdendun. <br />Precipitation d~ta were taken fro~ "NOAA ;,tlas ~2, Pre'ipHHion-FreQuer,y <br />Atlas of the ~'esterr_ Unite:: States, I'cluroe I II, Colorado." <br />The lOO+ye~r disch~rges CO"'Put~(l for ~€'1eql loc~tl(.)"S "';t~I;~ the <br />draiMge b~sin ~re shown en the next Dilge in TatJle 1 oS well d, ill <br />Table Ii. <br /> <br />TREE GRGIOTI' ALOliG CHMNEL <br />{STA59+0) <br /> <br />,9 <br /> <br />"" <br />-" <br />